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C. P. W. DOHRING. PRODUCING FIRE PROOF WALLS AND GBILINGS.

No. 432,023. Patented July 15, 1890'.

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UNITED STATES 'PATENT OFFICE.

CARL FRIEDRICH WILHELM DHRING, OF BERLIN, GERMANY.

PRODUCING FIRE-PROOF WALLS AND CEILINGS.

SPECIFICATION forming part of Letters Patent No. 432,023, dated July 15,1890.

Application filed Aprill, 1890. Serial No. 348,200. (No specimens.)

peror, and aresident of Berlimin the German Empire, have inventedcertain new and useful Improvements in Producing' Fire-Proof Walls andCeilings,of which the followingis a specification.

My invention relates to improvements in producing` fire-proof walls,ceilings, or coatings of the same; and it consists of the employment oftextile fabric for retaining the fire-proof mortar or plasterin the openspaces of the metal structure until the mortar or plaster has entirelyset or hardened.

It has been proved by experience that in producing fire-proof walls orceilings by the employment of a simple narrow meshy wire net-work, whichhas been hitherto embedded within layers of mortar or plaster forretaining the latter within the open spaces of the structure, nosatisfactory results have been obtained. This is due to the circumstancethat the greatest attention must be paid in stretching the wire-gauze tothe necessary extent when employed for ceilings, and, furthermore, theemployment of such narrow meshy and strong wire-gauze will considerablyincrease the cost of the production of fire-proof walls and ceilings.

- To overcome these disadvantages is the object of my presentinvention,and the manner t0 carry the same into effect will beunderstood by means of the accompanying drawings, in which- Figure l isa section of a fire-proof partition made according to Iny invention.`Fig. 2 shows a modification of the same. Fig. 3 illustrates a textilefabric provided with loops for the reception of single bars or wires toform a subordinate structure of the fire-proof partition, and Figs. etand 5 are two different sections of a structure provided with afireproof coating for a ceiling produced according to my invention.

In producing hre-proof walls, ceilings, and other partitions a textilefabric-such as linen, cotton, or jute canvas-is fastened to thestructure in such a manner that the open spaces of the latter will befilled out with or without the addition of metal bars or rods b by thetextile fabric c. If such a subordinate structure of bars or rods l) isemployed, the textile fabric must be rigidly connected to same by meansof wires or cords, and the fabric may be attached to such bars or rods,so as to form either a plane, Figs. l, 3, 4, and 5, or a corrugatedsurface, Fig. 2. In either case a close-Woven fabric is required tosecure the adhesion of the mortar or plaster, which is preferablyapplied to the fabric as a liquid pulp by means of an ordinarymasonscoop. As soon as this primary coating of mortar or plaster issufficiently hard so as to render the fabric quite steady I continue tothrow mortar or plaster from one or both sides of the fabric until thelatter and the structure `are entirely embedded into the plaster. 'lhefabric may be stretched either directly over the bars or rods c, whichinsome cases may be arranged so as to form a :network having very widemeshes, or it may be fastened to the main structure andthe metal bars ornet-work connected at a certain distance apart from the fabric Fig. 3.In this case the bars or net-work may be suspended by Wire loops orclamps d, which have to be fastened either to themain structure or theymay be connected to the tissue or fabric prior to the fastening of thelatter to the structure. The textile fabric is vonly adapted to retainthe plaster or mortar within the open spaces of the structure orauxiliary metal net-work until the mortar or plaster, forming athroughout-uniform fire-proof coating, has fully set and become hard. Incase of lire the textile fabric cannot destroy the plaster coating bydilatation; but it will be only carbonized, while the'expansion of thebars b or of the metal net-work will take place only in rectilinear ornearly rectilinear direction, so that they cannot cause any destructiveaction upon the wall or ceiling. In some cases the textile fabric may beimpregnated in the usual manner with convenient solutions" such aswater-glass, chloride of calcium, alum, or the like-in order to renderit also fireproof.

Instead of usingmetal bars t, I prefer in some cases to use laths,either impregnated or not.

Vhen using a metal net-work with wide meshes, the textile fabric mayeither be at-` tached thereto or woven together with the same topermitits rolling up, that it may be IOO manufactured and brought intrade ready for use. The textile fabric then occupies the Spaces formedby the metal net-Work, in order yto retain the mortar or plaster Whileproducing the walls or ceilings. Instead of attaching or Weaving thetextile fabric together with the metal net-Work, I may attach only theloops d, of suitable length, to the fabric for the suspension of thebars b, adapted to form the subordinate structure of the fire-proofpartition, Which will be particularly applicable in producing fire-proofceilings. The

textile fabric provided with such loops is particularly adapted to bemanufactured and brought in trade ready for use.

Having noW particularly described my said invention, what I claim, anddesire to secure by Letters Patent, is-

1. As an improvement in fire-proof Walls, ceilings,Vv and otherpartitions, the combination of a textile fabric, a subordinate structureformed of bars, laths, metal net-Work or the like, and a coating offire-proof material, substantially as set fort-h.

2. The combination of a metal net-Work with a tissue of fibrous materialand with a mortar coating;` applied to the same, substantially asspecied. l

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 25th day of March,

CARL FRIEDRICH WILHELM DHRING. Vitnesses:

ALEXANDER-Sworn, DIEDRICH PETERSEN.

